AN2333 Freescale Semiconductor / Motorola, AN2333 Datasheet - Page 4

• Manufacturer Part Number: AN2333
• Description: Maximizing the Performance of Two Fast Ethernet Links on MSC8101 FCCs
• Manufacturer: Freescale Semiconductor / Motorola

IEEE 802.3 Ethernet Basics
1.3 MSC810ADS FCCs Running Ethernet
1.4 Control and Data path
4
2
3
For details on the MSC8101 FCCs, consult the MSC8101 Reference Manual (MSC8101RM/D).
For details on RMON counters, consult the chapter on FCC Fast Ethernet Controllers in the MSC8101 Reference
Manual (MSC8101RM/D).
The MSC8101 communications processor module (CPM) includes two fast communication controllers
(FCCs) that can operate in Ethernet mode up to 100Mbits/s. Key features of these FCCs, which make it
easy for the SC140 core to handle the Ethernet payload traffic, are as follows:
• MII
• MAC layer functions of fast Ethernet and IEEE 802.3x
• Framing functions
• Full collision support
• Bit rates up to 100 MBPS
• Multi-buffer data structure
• CRC generation
• Logical. 64-bin group address hash table plus broadcast address checking
• Promiscuous mode
• Special RMON counters for monitoring network statistics.
The block diagram shown in Figure 2 gives an overview of the different control and data flows of
MSC8101-based systems for Ethernet operation.
Port B15 (PA17)
Port B16 (PA16)
Port B17 (PA15)
Port B18 (PA14)
Port B02 (PA30)
Port B01 (PA31)
Port C12 (D20)
Port C13 (D19)
side of the FCC in Ethernet mode. They provide an approximate measure of the incoming network
traffic without the need to implement software counters.
Port Line
Freescale Semiconductor, Inc.
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Table 3.
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RXD0
RXD1
RXD2
RXD3
CRS
COL
MDIO
MDC
FCC1 MII Device Pinout and Board Pinout (Continued)
Function Set
In
In
In
In
In
In
In/Out
Out
Direction
3
This set of counters monitor the receive
FCC1 Rx Ethernet
FCC1 Rx Ethernet
FCC1 Rx Ethernet
FCC1 Rx Ethernet
FCC1 Control Ethernet
FCC1 Control Ethernet
PHY1 Management
PHY1 Management
2
Function